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  • Strength Graded sizes in C24 Softwood – Joists-Support Construction Timber

    Strength Graded sizes in C24 Softwood - Joists-Support Construction Timber Puidukoda

    Graded C24 Structural Stress Graded Premium Construction Timber Joists Puidukoda

    Strength Graded sizes in C24 Softwood - Joists-Support Construction Timber Puidukoda

    Graded C24 Structural Stress Graded Premium Construction Timber Joists

     

    We supply bulk, wholesale large volume of planed regularised (Reg) C24 Graded Stress Structural Graded Softwood with eased edges, carcassing joists for construction. The visual quality is considered premium as its selected both for strength and visual appearance from slow grown

    Strength Graded sizes in C24 Softwood - Joists-Support Construction Timber Puidukoda

    C24 Graded timber joist softwood carcassing structural timber.jpg

    Russian, Nordic and Scandinavia. We can supply it pressure impregnated with Tanalith E, Tanatone or equivalent Tanalised UC3 in Green or Brown tones, or clear Vac Vac – Protim / Vacsol etc. We can arrange for full packs or mixed loads to be delivered throughout the UK and Ireland.Please find more information on our downloads section.

    All our timber is  FSC Chain of Custody (CoC) and manufactured in our factory with ISO 9001 Quality Management Standard Certification.

    All our timber meets the Construction Products Regulation (CPR) i.e  CE Marking and Standards: planed regularised Strength Graded timber / carcassing is C24 to BS EN 14081-1:2016 and BS EN 338: 2016, BS 4978, BS 336

    Strength Graded sizes in C24 Softwood - Joists-Support Construction Timber Puidukoda

    C24 Bulk Wholesale Softwood Graded Carcassing Construction Timber Joists

     

     

     

    The common sizes we supply include the following;-

    Nom. Nominal Size Metric in mm Nom. Nominal Size Imperial in inches (“) Fin. Finished Size Metric in mm Species

    WW = Whitewood, Spruce

    RW = Redwood, Pine

    LH = Siberian Larch

    Certification Chain of Custody

    (CoC)

    FSC

    Moreover, Strength Graded Class

    Number of pieces Pces  in  a bulk pack Shipment Prompt

    To order for preservative treatment

    Finish

    Planed Smooth and 3mm 4 rads ( radius)

    Eased edges

    Reg. regularised

    50x50mm 2×2 45x45mm WW & RW FSC 352 Prompt Planed smooth with eased edges
    50x75mm 3×2 45x70mm WW & RW FSC & C24 224 Prompt Planed smooth with eased edges
    50x100mm 4×2 45x95mm WW & RW FSC & C24 176 Prompt Planed smooth with eased edges
    50x125mm 5×2 45x120mm WW FSC & C24 144 Prompt Planed smooth with eased edges
    50x150mm 6×2 45x145mm WW & RW FSC & C24 112 Prompt Planed smooth with eased edges
    50x175mm 7×2 45x170mm WW FSC & C24 96 Prompt Planed smooth with eased edges
    50x200mm 8×2 45x195mm WW FSC & C24 80 Prompt Planed smooth with eased edges
    50x225mm 9×2 45x220mm WW FSC & C24 80 Prompt Planed smooth with eased edges
    50x245mm 10×2 45x245mm WW FSC & C24 64 Prompt Planed smooth with eased edges

    Overview of Strength Graded Timber

    C16 or C24 Timber

    C16 and C24 are the most common used softwood timbers within the UK. They are widely used in both domestic and commercial projects, but with the two timbers ideally suited to different and specific loads, it can be difficult to know whether you are using the best timber for your construction. Here we have a rundown of the qualities of the two timbers to help you evaluate the whether C16 or C24 timber selection for your project.

    Strength Graded sizes in C24 Softwood - Joists-Support Construction Timber Puidukoda

    C24 Structural Softwood Puidukoda

    Grading timber

    The strength of timber is evaluated after the wood has been kiln dried to below 20% moisture content. The timber goes through an automated  or visual grading line where various measurements are taken that indicate the strength of the wood, with physical defects such as knots and pinworm holes lowering the strength of the timber. The ‘C’ grading simply stands for conifer, the variety of tree the timber is made from while the number indicates the strength, with the specific measurements allowed outlined in the table below:

    Strength Class       C16       C24
     Bending parallel to grain (N/mm2)  5.3  7.5
     Tension parallel to grain (N/mm2)  3.2  4.5
     Compression parallel to grain (N/mm2)  1.8 7.9
     Compression perpendicular to grain (N/mm2)  2.2-1.7  2.4-1.9
     Shear parallel to grain (N/mm2)  0.67  0.71
     Modulus of elasticity mean (N/mm2)  8,800  10,800
     Modulus of elasticity minimum (N/mm2)  5,800  7,200
     Characteristic density (kg/m5)  310  350
     Average density (kg/m5) 370 420
    Strength Graded sizes in C24 Softwood - Joists-Support Construction Timber Puidukoda

    C24 Structural Stress Graded Premium Construction Timber Joists Puidukoda UK Ireland

    If you would like more information on the guidelines for the grading of timber, the standards BS EN 14081-1:2016 and BS EN 338: 2016, BS 4978, BS 336  or  BS EN 1995-1-1:2004+A2:2014 which has replaced  BS5268-2:2002 have all the information you need.

     

    C24

    C24 boards have fewer defects than C16 graded timber and the timber is therefore stronger and more resilient than C16 boards. You will also find that C24 boards have a more uniformed and neat appearance as there are fewer physical imperfections on the surface of the board. C24s are not as widely used as C16 as the timber is much more expensive because the demand for high standard boards means that there are a lot of boards rejected, so you gain less timber from the same amount of wood as you would C16 boards. Generally, C24 boards are mainly imported from slower growing timber regions.

    C16 or C24 timber: Which is better?

    It is impossible to state categorically that one timber grade is better than the other as the preferred timber for your project comes down to what features are important to you.

    With regards to strength and load carrying, C24 boards are clearly superior to C16, however, C16 timber is strong enough for most projects and will certainly meet your performance requirements at a much cheaper cost than C24 boards.

    If the aesthetic appeal of your timber is important – if you would like to leave the boards unvarnished, for example – then again, C24 is more beneficial than C16 boards. The main benefit of C24 over C16 boards in instances where both boards are adequate is that C24 boards can have a wider rafter centre or a smaller deck board section, giving you more choice in the finished aesthetic.

    C24 timbers mainly being reserved for projects such as balconies and bridges, where aesthetics and strength are important.

    Please visit our product videos page for more information on timber cladding, flooring, decking, mouldings/profiles, fire treatment –  product, manufacture and installation information.